/**
 * Hook that runs a callback at a specified interval
 *
 * @param callback - Function to call on each interval
 * @param delay - Delay in milliseconds (null to pause)
 *
 * @example
 * ```tsx
 * const Timer = () => {
 *   const [count, setCount] = useState(0);
 *   useInterval(() => setCount(c => c + 1), 1000);
 *   return <div>{count}</div>;
 * };
 * ```
 */
export declare function useInterval(callback: () => void, delay: number | null): void;
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